>>> Strikethrough (extension) - 491
~~Hi~~ Hello, world!
<<<
<p><del>Hi</del> Hello, world!</p>
>>> Strikethrough (extension) - 492
This ~~has a

new paragraph~~.
<<<
<p>This ~~has a</p>
<p>new paragraph~~.</p>
>>> single tilde
~Hi~ there.
<<<
<p><del>Hi</del> there.</p>
>>> single tilde with double tilde
~Hi~~ there.
<<<
<p><del>Hi</del>~ there.</p>
